復讐の隊士 - レベル9999の幕末異世界転生

It is the end of the Edo period. One day, the Shinsengumi are suddenly reincarnated into another world. Hangya, their guide to the other world, tells them, "There is only one thing you need to do to return to your world. Defeat the Demon King." This is the story of how the weakest soldier becomes the strongest. (Source: Line Manga, translated)